Using [1]} then gives
\(\Vert {R(z,\mathcal {A})} \Vert _{\mathcal {L}([X^*,Y]_\theta ,[Y,[X,Y]_\epsilon ]_\theta )} \leqslant \frac{C_{c_0,\mathcal {M}_0}}{1+\vert {z} \vert ^{\epsilon \theta }}.\) 
